Wrist watch spring bar



June 6, 1950 N GUARN|ER| 2,510,695

wRIsT'wATcI-x SPRING BAR Filed Dec. 5, 1946 .if 20 Z7 Patented June 6, 1950 UNITED STATES PATENT OFFICE WRIST WATCH SPRING BAR Nunzio Guarnieri, New Orleans, La.

Amplicationk December 5, 1946, Serial Nos'ilii?,

1 Claim. 1

The present invention relates to improvements in Wrist Watch spring bar and relates more particularly to the spring dov/el bars commonly used to attach Wrist Watches to Wrist bands or bracelets.

Anobject of the invention is to provide an irnproved sprinlg bar construction in which the length of the bar is regulatable to t differential distances between the Wrist watch lug holes, the arrangement providing for detachable sections on either or both the tube and the plunger whereby one or both maybe shortened by the removability of such detachable sections o1" may be ,correspondingly lengthenedj the addition of sections orv clippings removed from other spring bars'v Where the saine are not needed.

Another object oi the invention is to secure the spring inthe receivingpipe or tube whereby the' same may not fall out, thisresulting-. in the greater' simplicity of bonstriictiomand mor'e fac'- ile assembly.

A still further object of the invention resides in so constructing the closed end of the receiving pipe or tube that the same has a double function of pinching the terminal end of the spring and thus anchoring the spring in the tube, and in the second place forming a xed trunnion or plug pin which enters one of the lug holes of the wrist Watch.

With the foregoing and other objects in View, the invention will be more fully described hereinafter and more particularly pointed out in the appended claims.

In the drawings, in which like parts are denoted by the same reference characters throughout the several views,

Figure 1 is a, side elevation of an improved Wrist Watch spring bar constructed in accordance with the present invention.

Figure 2 is `a longitudinal section taken on the line 2 2 in Figure 1.

Figure 3 is an end elevation looking from the left end of Figure 2.

Figure 4 is a transverse section taken on the line 4-4' in Figure 1.

Figure 5 is a similar section taken on the line 5-5 in Figure 1.

Figure 6 is a side elevational view of a form of plunger or length bar employed.

Referring more particularly to the drawings, I0 designates a receiving pipe or tube having an open end Il and a closed end I2. Circular grooves I4 are made in the external Wall of the tube IIJ. One such groove is spaced from the open end II by a predetermined distance and .2Y the other grooves maybe spacedv like distances' apart; The grooves form ridges between the samel The Walls of the grooves are' preferably' convergent inwardly to a point or annular line and such grooves may penetrate any desired dis= tance into` the 'material of' which the tube` lili is made. IThe grooves I'll so placed and formed produce planes of denitive Weakness Whereverv occurring and the sectionsY or clippingsv of they vide a: stationary plug pin or trunnion i5 whichl isA alsc-v tubular in form and producesv interiorly a; narrow' neck in which the long terminal end. I6' of the helical spring tlf isV pinched inv th'ef act of drawing the metal iii-together.. Thislongy ter-A minal end Iii is preferably brought- 'oit from? the helix Il in alignment With the axis of such helix and thus has the effect to hold the spring I'I in a central'position Within the tube Il! and to prevent such spring from dropping out of the tube I.

Slidably mounted through the open end II of the tube l ii is the length bar or plunger I8 which may be made from a solid round bar of metal. This plunger I8 `has formed or carries at one end thereof a plug pin or trunnion I9. V-s-haped or other circular grooves 2U are formed at axially spaced intervals on the plunger I8 beginning from the inner end thereof for the same purpose as the grooves Ii namely that such plunger I8 may be shortened by breaking off sections thereof Ialong the planes defined by the grooves 20 which Will cause the shearing to be accomplished along straight lines and the break to be clean.

In the use of the device, the receiving pipe or tube IU initially receives the spring II and has the reduced trunnion end I5 pinched together upon such terminal end I6. The plunger I8 may be then freely introduced into the open end II of the tube Ill and made to engage the free end of the :coil spring Il. The arrangement will be such that the tube It and the plunger I8 must be moved together to compress the spring I'I in order that the trunnions I5 and I9 shall t between the lugs of the Wrist Watch frame, Whereupon the spring II will move the trunnions apart and into the lug holes.

As an example merely but to which it Will be understood that I am not limited in dimensions, a spring bar will be put on the market in the most popular length size of 5A; of an inch. If a longer spring bar is needed than the normal bar, one has only to remove the plunger I8 and insert into the receiving pipe or tube I0 one of the clippings from a previous operation. After this is done, the plunger I8 may be replaced in the tube I 0. If the gap between the wrist watch lug holes is shorter than 5/8 of an inch, the jeweler may begin tearing or cutting one or more of the sections or clippings from the plunger I8, and also if desired from the receiving pipe or tube I0, until the required over-al1 length is reached. The improved spring bar can easily be built up to reach a length of an inch and a quarter and may be shortened down to a quarter of an inch. By anchoring the coil spring I1 in the receiving tube I0, the attention of the jeweler is taken away from any need of holding the spring in place or uprighting the open end II of the tube I0 while assembling the plunger I8 thereto. This simplifies the manual assembly.

It will be noted that this new type of manufacture makes the band stronger particularly where the integral trunnion I 5 is fashioned from the closed end of the receiving tube I0.

It will also be noted that the improved construction is simple and safe, inexpensive and easy to remove for changes of diierent watch attachments such as bands, straps, etc. The invention provides a rigid construction which will not bend easily and which will hold firmly to any watch. The devices may be made of stainless steel or any other non-corrosive metals, as well as brass, to insure long life and durability.

The length bar I8 as shown in Figure 6 may be made as a solid bar or as a hollow bar, the same as the receiving pipe I0. If the length bar is made in the hollow form, the spring I 'I may be placed therein besides being attached to the stationary plug pin I5. Thus, more spring action may be obtained if desired.

The pipe I0 may be made as long as desired. The greater the length the greater the stability of the spring bar as a whole.

While I have disclosed herein the best form of the invention known to me at the present time, I desire it to be understood that I reserve the right to make changes and modications in the herein described embodiment of the invention provided such changes fall within the scope of the following claim.

What I claim is:

A wrist watch spring bar comprising a receiving tube having one end open, a plug pin on the opposite end of the tube, a plunger slidably ree ceived by said tube through its open end, a plug REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 653,912 Heggie July 17, 1900 1,730,920 Dinstman Oct. 8, 1929 1,742,457 Wittman Jan. 7, 1930 2,063,733 Greenberg Dec. 8, 1936 2,111,357 Cornell Mar. 15, 1938 2,358,990 Maxwell Sept. 26, 1944 Konikoi Jan. 1, 1946 

